(Kaiser Health News) – A Kaiser Health News and USA Today Network and investigation found that surgery centers operate under such an uneven mix of rules across U.S. states that fatalities or serious injuries can result in no warning to government officials, much less to potential patients. The gaps in oversight enable centers hit with federal regulators’ toughest sanctions to keep operating, according to interviews, a review of hundreds of pages of court filings and government records obtained under open records laws. No rule stops a doctor exiled by a hospital for misconduct from opening a surgery center down the street.